The Effect Of Polycprolactone Concentration And Maleic Acid Anhidride Compatibiler On The Characteristics Of Maizena Glucommanan Bioplastic Composites

Abstract

The weaknesses of cornstarch and glucomannan bioplastic composites is they are hydrophilic, as a  result, these bioplastic composites have swelling values, WVTR, tensile strength, elongation at break,  and young modulus do not comply with the Standar Nasional Indonesia. This study was to determine  the effect of the concentration of polycaprolactone and maleic anhydride and their interaction on the  characteristics of the cornstarch-glucomannan bioplastic composite, and to determine the concentration  of polycaprolactone and maleic anhydride compatibilizer which can produce the best cornstrach-glucomannan bioplastic composite. This study used a randomized block design with two factors. The  concentration of polycaprolactone which consists of 3 levels 10%, 12.5%, and 15%. Factor II is the  concentration of maleic anhydride which consists of 3 levels 2.5%, 5%, and 7.5%. The variables  observed were tensile strength, elongation at break, young modulus, swelling, WVTR, biodegradation  and FTIR. The data obtained were analyzed for diversity (ANOVA) and continued with Duncan's test.  The results showed that the concentration of polycaprolactone and maleic anhydride and their  intereaction had a significant effect on tensile strength, young modulus, WVTR, and swelling except for  the elongation at break and biodegradation. Concentration of 15% polycaprolactone and 5% maleic  anhydride produced the best composite bioplastic with a tensile strength of 16.16 MPa, elongation at  break of 2.610%, modulus young of 627 MPa, swelling of 30.26%, WVTR 0.64g/m2.hour and  degradation time for 7.33 days. Cornstrach-glucomannan bioplastic composites with concentrations of  polycaprolactone and maleic anhydride produced new functional groups, namely carbonyl groups C=O  and alkynes C≡C.